Theory advances for $t\bar{t}W$ multi-lepton predictions

We report on recent theoretical advances in the description of the $pp\to t\bar{t}W$ process. First, we discuss a comparison of many state-of-the-art predictions for multi-lepton signatures including the leading QCD contributions at $\mathcal{O}({\alpha }_s^3{\alpha }^6)$ as well as subleading EW contributions at $\mathcal{O}({\alpha }_s{\alpha }^8)$. Furthermore, we briefly discuss recent improvements using multi-jet merging techniques.